My worry is that E-Ink Monitors will never reach the "minimum quality" point at which they are adopted by a sufficient number of people to get the ball rolling.

I don't suffer from any medical reason to use one, but, I would absolutely purchase one this second (any pay a lot for it) if it worked well. Unfortunately, what I've seen so far from the Dasung and the Onyx, isn't worth $800. I just hope these companies have enough runway to continue improving the product such that early adopters like myself, will jump in.